Corona discharge and electrogasdynamic flows in the air

Abstract

A corona discharge is closely related to the electrogasdynamic flows (electric wind) accompanying it. These phenomena have been considered in numerous studies and described in several monographs. Usually, they are investigated separately, because it is assumed that electric wind develops exclusively in the external region of the corona discharge. However, because a distinct boundary between the ionization layer and the external region is absent, the relation between these processes is being investigated in a number of current studies treating these phenomena in conjunction with each other. The results presented in this paper were mainly obtained in such studies.

Computational and Experimental Study of Time-Averaged Characteristics of Positive and Negative DC Corona Discharges in Point-Plane Gaps in Atmospheric Air

“…of a pronounced maximum close to the axis. Note that similar profiles of E have been obtained in simulations [6] of positive and negative dc air coronas in a sphere-plane gap.…”

“…A peculiar spatial distribution of the radiation intensity in negative coronas, seen in the bottom two rows of Fig. 8, was obtained also in [6] and is governed by the specifics of n e and E distributions. In particular, a radial constriction of the electric field at the tip [Fig.…”

“…models; see [5], [6]. However, such solvers are highly, and in many cases, prohibitively, computationally intense.…”

Single‐stage plasma‐chemical synthesis and characterization of carbon nanoparticle‐polymer suspensions

“…This area has a nearly spherical shape with an outer diameter of around 0.5-1 mm and an inner diameter of~0.1 mm apart from the surface of the corona-forming electrode. [14,19] The second region, the streamer, arises at sufficiently high electric field strengths E = 7-8 kV/cm, it turns into a spark with an increase in E. [19,20] The characteristic duration of the streamer in our experiments was~10 −8 to 10 −5 s. The heat is generated from such an energy source in a small volume restricted to the length of the discharge gap and a streamer crosssection that does not exceed the size of the avalanche head at the stage of its largest expansion,~0.1-1 mm. [21] The allotropic form of carbon particles formed in the discharge area depends on the absolute value of the temperature in the corresponding region.…”

“…[ 22 ] The temperature is different in the first and second discharge areas and is determined by the electric field strength via the current density, and the monomer vapor concentration in the plasma‐chemical reactor. [ 18–21 ] Therefore, it is likely that the allotropic form of carbon particles formed in these regions could differ. The average temperature was estimated in the framework of the model with a point (for the corona), linear (for the streamer) and instant heat source, in the approximation of the frozen parameters of the medium.…”